SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
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Old Dec 28, 2012, 03:57 PM
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Nope!

Time to investigate the culprit the tracker work very well in my home, but not in the field...

I have here 5 lm1881 chips, two of them (1st batch) work very well, the other 3 also work well together, but they don't mix well. I have to teak the code to work well with mixed batches of chips.

Tomorrow will take the pc with me to the field to try to understand what's going on there that prevents the tracker from working well.

In regard of the video telemetry for the openMAXosd the "module" is working well in the bench (wired and wireless), now it's time to integrate it in the openMAxosd code.
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Old Dec 28, 2012, 04:13 PM
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Ok guys, here is schematic for 5.8GHz AV from Hobbyking (Boscam) - inverting amplifier



And some pics








Now I'm going to connect servos. I hope that it will works
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Last edited by Grzechu; Dec 28, 2012 at 04:21 PM.
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Old Dec 28, 2012, 04:29 PM
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keep the fingers crossed
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Old Dec 28, 2012, 04:48 PM
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Is it possible to use the ardupilot as the autopilot + upload the code from the openat and use is as antenna tracker TX as well ?
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Old Dec 28, 2012, 05:49 PM
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I think it could be possible, you just have to program two new PWM outputs (two new for the AT or two new for the AP) because I use two them of the original code for PAN and TILT.

If you manage to advance, please share the code here.
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Old Dec 28, 2012, 10:16 PM
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Colombia, Bogota
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hi Jalves,
Would you please give a quick look to my material list? I have to make international order and it will take some time. I am working in CAD standard design for mechanical so you can make this proyect standard and share in ur wiki if you like, later I can improve the electronic diagrams.

main elements:
  • 2 x Servos (Hitec HS-645MG)
  • 2 x Arduino Pro Mini 328 - 5V/16MHz
  • bateries, bec
  • resistors and other minor elements

1. Do I need arduino Demilanove as RX side or is ok with arduino pro mini as the link below?
https://www.sparkfun.com/products/11113

2. What about LCD, do we need it? I found one below.
https://www.sparkfun.com/products/10862

thanks for your comments sorry for silly questions (but I hurry to order).
regards,
Andres Q.
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Old Dec 29, 2012, 05:16 AM
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The servos are good ones, but a little to much in strength (to much torque for our usual antennas, what antenna you pretend to use?), but for PAN you only get about 120~180 degrees with these servos.

No need to change anything in the code but bear in mind the 180š PAN.

You can use any arduino board with the atmega328 , I prefer the duemilenouve/uno for the ground station, but use a mini pro in the model plane.

You can use a lcd, but the tight timings don't recommend its use.

Check the good working of the tracker before adding the lcd to the tracker.
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Old Dec 29, 2012, 01:16 PM
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thanks a lot, itīs clear now.
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Old Dec 29, 2012, 02:17 PM
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I wonder how easy is to replace the pan servo with a stepper motor?
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Old Dec 29, 2012, 03:28 PM
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Quote:
Originally Posted by typicalaimster View Post
I follow the Wiki when I assembled mine.

http://code.google.com/p/opendiyantr...ki/Connections

I went with a Arduino Nano instead of a Mini... I'll probably scale mine back to two Nano's vs a Mini and a Uno.

TX:
1 - Arduino Board
1 - 1.8k Resistor
1 - 8.2k Resistor
1 - GPS

RX:
1 - Arduino Board
2 - 100k Resistors
1 - LED
1 - Resistor to match your LED (470 ohm on the schematic)
1 - Push Button
1 - 0.1uF Ceramic Capacitor
1 - 360 degree servo
1 - Servo

For the 360 degree servo I hacked the servo and removed the internal potentiometer and gear stop. I added a external 5k ohm potentiometer.

Hope that helps!
Hi, can I use Futaba S3305 for PAN? unfortunately i dont have to many options i found that one in similar proyect and towerhobbies store. Thanks for your recommendation.

S3305
Operating Voltage: 4.8-6.0 Volts
Operating Speed (4.8V): 0.25sec/60 degrees at no load
Operating Speed (6.0V): 0.20sec/60 degrees at no load
Stall Torque (4.8V): 99 oz/in. (7.1kg.cm)
Stall Torque (6.0V): 124 oz/in. (8.9kg.cm)
Operating Angle: 45 Deg. one side pulse traveling 400usec
360 Modifiable: Yes
Direction: Counter Clockwise/Pulse Traveling 1520-1900usec
Potentiometer Drive: Indirect Drive

Thanks for your comments.
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Old Dec 29, 2012, 04:26 PM
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Folks,

One little question to you all:

Who from you, that are reading this question, has this Antenna tracking device mounted, in working order and use it in the RC field with regularity?

I would like to hear cases of success (or the lack of it...)

Thanks.
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Old Dec 29, 2012, 05:07 PM
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here is my arduino's i will start next week
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Last edited by pisagor; Dec 29, 2012 at 06:44 PM.
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Old Dec 30, 2012, 05:01 PM
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Jalves, what sould I change in TX if I want to use pin 11 instead of pin 10? I burnt it

I changed
" pinMode(11,OUTPUT);"

But it doesn't work
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Old Dec 30, 2012, 05:06 PM
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Quote:
Originally Posted by Grzechu View Post
Jalves, what sould I change in TX if I want to use pin 11 instead of pin 10? I burnt it

I changed
" pinMode(11,OUTPUT);"

But it doesn't work
It's not "just a pin"
Pin 10 is the MOSI-pin if I remember correctly. It have a 8-bit buffer to send out chars, and can be used at a high speed (8MHz).

If you have really fried pin 10, I would suggest to buy a new Atmega328P. If it's an Arduino with the Atmega328P in socket, you can get them quite cheap with bootloader.
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Last edited by Dennis Frie; Dec 30, 2012 at 05:21 PM.
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Old Dec 30, 2012, 05:20 PM
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Hm, I don't say precisly. I can't solder into pin 10, now it is pure laminate. I know that I can solder it into atmega or ftdi but I don't have good soldering.

Eh, again costs This will be my third Arduino nano ^^

So, it can be only pin 10?

I found:

SPI: 10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK). These pins support SPI communication, which, although provided by the underlying hardware, is not currently included in the Arduino language.
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Last edited by Grzechu; Dec 30, 2012 at 05:25 PM.
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